Abstract
Non-Fermi-liquid (NFL) behavior in three-dimensional metals with strong electron correlations can have different origins, viz. collective or single-ion effects. The former is manifest at a magnetic instability where the system changes from a nonmagnetic to a magnetic ground state as a function of some parameter like concentration or pressure. We review the properties of the exemplary NFL heavy-fermion system CeCu 6− x Au x at this magnetic instability, i.e. a logarithmic divergence of the specific-heat coefficient γ( T) = C/ T, a cusp in the magnetic DC susceptibility χ( T) for T → 0, and a T-linear contribution Δϱ to the electrical resistivity, as opposed to the Fermi-liquid behavior γ ∼ χ ≈ const, Δϱ ∼ T 2 found in many heavy-fermion systems, including the parent compound CeCu 6. Single-ion effects leading to NFL behavior are overscreening of magnetic or quadrupolar degrees of freedom of a magnetic impurity or a distribution of Kondo temperatures in a disordered alloy. Similarities and differences of the NFL phenomenology between these scenarios will be reviewed.
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